Haven't seen this before but with Xubuntu 11.10 several programs run with a Raleigh type theme, similar to how if you're using a theme in /home Synaptic will open with the Raleigh theme (or the Xfce equivalent). Aislerot and Rhythmbox are two examples.
I don't remember 11.04 doing this.
Thanks for any solution.
Bookmarks